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License Revenue with 3D Medicines, Inc. - Deferred Revenue (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 5,600,000 |
Additions |  |  | 2,000,000 |
Revenue Recognized | $ (1,900,000) | $ 0 | (7,600,000) | $ 0
Ending balance | $ 0 |  | $ 0 |

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